Hoisting mechanism



Feb. 17. 1925. 1,526,767

I. BENJAMINS HOISTING MECHANISM Filed Nov. 6, 1920 Patented Feb. 17,1925.

UNITED STATES PATENT OFFICE.

l ISRAEL IBENJAMINS, OF BROOKLYN, NEW YORK.

HOISTING MECHANISM.

Application filed November 6, 1920. Serial No. 422,368.

ful. Hoisting Mechanism, of -which the following is a specification.

My invention relates to improvements in hoisting mechanisms which may beused for dental and barbers chairs, as jacks for automobiles, carriagesand wagons, also for scaffolds and for sundry other purposes for whichthe construction of my hoisting mechanism is adapted, and it consists inthe novel features hereinafter more fully described.

The objects of my improvement are:

First, to provide a collapsible hoisting mechanism with a base pivotallyconnected tothe lower ends of the legs thereof, without having anysliding parts at'said base.

Second, to-provide a saddle of constant length for the support of theload, said saddle being also pivotally connected to the upper ends ofthe bars or links composing my hoisting mechanism also Without anysliding parts at said saddle. Y Third, to distribute the load on bothpanels of my hoisting mechanism substan-' tially equally, therebyreducing the strains thereon.

Fourth, to have my hoisting mechanism, when employed as a jack forautomobiles, operated by a key wrench extending rearwardly of theautomobile into a convenient position for the operator; and

Fifth, to have my hoisting mechanism simple, durable, light andinexpensive.

I attain these objects by the mechanism illustrated in the accompanyingdrawings or by any mechanical equivalent or obvious modification of thesame.

In the drawings Fig. 1 is a side elevation of my hoisting mechanism,with the ends of the screw 22-23 broken off Fig. 2 is a section on theline C-D of Fig. 1, with the screw omitted.

Fig. 3 is an elevation .of one of the bearing pins 29-27, looking fromright to left in Fig. 1.

. Fig. 4 is a plan of the saddle 3031; Fi 5 is a section of the saddleon the line Al3 of Fig. 1. v

Fig. 6 is an elevation of one end of the screw 22-23 showin the taperedconnection to the key wrenc 25;

Fig. 7 is an end view looking from right to left in Fig. 6; Fig. 8 is across-section of the socket end of the key wrench; Fig. 9 is anelevation of the key wrench partly brokenoil and showing the handle asbroken off at both ends.

Similar numerals and letters refer to similar parts throughout theseveral views. 11 and 12 are a pair of inclined links or bars, pivotallyconnected at their lower ends to thebase 20 by means of the pins 33 and32 respectively, and shown as crossing each other at a variable point oftheir length; th upper ends of said bars 11 and 12 are pivotallyconnected each to one end of the nuts 19 and 18 respectively by means ofthe pins 34 and 35 respectively.

11 and 12 are a pair of bars pivotally connected at their lower ends tothe base 20 by means of the pins 32 and 33 respectively; the bar 11* isparallel to the bar 11, and the bar 12 is parallel to the bar 12; theupper endsof the bars 11 and 12 are pivotally connected to the nuts orposition members 19 and '18 respectively by means of the pins 34 and 35respectively. The distance be- ..betiween the centers of the pins 34 and34 is the same as thedistance between the centers of the pins 33 and 32,which is also the distance between the centers of the pins 35 and 35.

It is,'theref0re, evident that the nuts 18 and 1 9 will always remainparallel to the base 20 for all an les of inclination of the bars 11 and12, which are always equally inclined to the base 20.

13 and 14 are a pair of bars similar to the bars 11 and 12 and pivotallyconnected at their lower ends to the nuts 19 and 18 respectively bymeans of the pins 36 and 37; 13 and 14 are a pair of bars parallel tothe bars 13 and 14 and pivotally connected at. their lower ends to thenuts 19 and 1% respectively by means of the pins 36 and 37.

The bars 13 and 14, also 13 and 14*, are pivotally connected at theirupper ends by means of the bearing pins 29-27, which have each therein acylindrical opening 28 adapted to receive one end 31 of the saddle 30.

The distance between the centers of the pins 29 is the same as 'thedistances between the centers of the pins 37 and 37* and the centers ofthe pins 36 and36. i

The saddle 30 is, therefore, substantially parallel to the nuts 19 and18 for all positions of the bars 13 and 14, which are equally inclinedto said saddle 30, except that the saddle 30 has a slight depression, asshown in Fig. 1, to fit the load, which may be the axle of anautomobile.

Two panels of bars 13, 14, l3 -and 14 may be used, the same as of thebars, 11, 12, 11 and 12", as shown in Fig. 2.

The journals 31 are provided in the saddle 30, as well as the bearings28 in the pins 2927, to permit the load to adjust itself to any angle,as when'the axle of an automobile is inclined, and to strain both panelsof the hoisting mechanism equally or near- 1 so.

22 and 23 is a right and left screw adapted to move the nuts 18 and 19towards each other to raise the load or away from each other to lowerthe load; one or both ends of the screw 2223 may be tapered and squaredas shown at 24 in Figs. 6 and 7 and adapted to fit a key wrench 25,which is provided at one end with a socket to fit the end 21 of thescrew 2223, and the other end with a vise-handle 26.

The key wrench 25 may be made long enough to place the handle 26 beyondthe body of an automobile and beyond all other obstructions, therebyrendering the hoisting mechanism more accessible and easy to operate.

Many other changes could be made in the details of my hoisting mechanismwithout departing from the main scope of my invention.

I do not therefore restrict myself to the details as shown in thedrawings; but I intend to include also all mechanical equivalents andreasonably obvious modifications of the same within the scope of myinvention.

What I claim as my invention, and desire to secure by Letters Patent is:

1. In a hoisting mechanism a base, a pair of inclined bars, pivotallyconnected thereto at their lower ends, a pair of position members,pivotally connected to the upper ends of said bars, and a means formoving said members towards or away from each other, combined with apair of bars parallel to said inclined bars and pivotally connected attheir lower ends to said base, and at their upper ends to said positionmembers, thereby insuring the stability of the mechanism.

2. An apparatus of the character described comprising a base, a movablesupport, a plurality of pairs of link members pivotally secured togetherand to said support and said base, engageable members secured to theouter intermediate ends of said link members, engageab e members securedto the inner intermedia e ends of said link members and a revolublemember for actuating said engageable members whereby to operate saidlink members and raise or lower said movable support, substantially asspecified.

3. In a hoisting mechanism a base, a pair of inclined bars, pivotallyconnected thereto at their lower ends, a pair of position members,pivotally connected to the upper ends of said bars, and a means formoving said members towards or away from each other, combined with a barparallel to one of said inclined bars and pivotally connected at itslower end to said base and at its upper end to one of said positionmembers, thereby insuring the stability of the mechanism.

4.1111 apparatus of the character described comprising a base, a movablesupport, a plurality of connecting members, each comprising four linkshaving their ends pivotally connected together and two of said connectedends secured to said movable support and two of said connected. endssecured to said base, engageable members secured to the connectedintermediate outer ends of each pair of said links, engageable memberssecured to the intermediate inner ends of each of said pair of links anda revoluble member traversing said engageable members, whereby toactuate the same to raise or lower said movable support, substantiallyas specified.

5. In a hoisting mechanism a pair of po sition members, a means fordrawing said members towards or away from each other and two oppositesets of inclinded bars, piv otally connected at their lower ends to saidmembers and at their upper ends to the opposite ends of a pair of pins,combined with bearings in said pins and a saddle for the load having atits ends journals swivelled in said bearings, thereby distributing theload on both sets of bars substantially equally and thereby reducing thestrain thereon.

6. An apparatus of the character described comprising a base, a movablesupport, a plurality of connecting members each formed of four linkshaving their ends pivotally connected together and forming overlappingparallelograms, said connecting members having their upper and lowerends respectively secured to said movable support and to said base, nutspivotally se cured to the connected intermediate ends of said connectingmembers, and a screw traversing said nuts for actuating the same andtheir related parts whereby to raise or lower said movable support,substantially as specified.

7. An apparatus of the character de scribed comprising a base, a pair ofoutwardly projecting studs upon the opposite sides thereof, a movablesupport, outwardly projecting studs upon its opposite sides, a pluralityof connecting members each formed of four links having their endspivotally connected together and forming for actuating the same andtheir related overlapping parullelograms and secured to parts, wherebyto raise or lower said movit'he studs upon the opposite sides of saidable support and to hold the same locked movable support and said base,nuts pivotto any intern'lediate position, substantially 5 ally securedto the connected intermediate as specified.

ends of said connecting members, and a screw in threaded engagementwithsaid nuts ISRAEL BEN J AMINS. I

